William f



(No Model.)

W. F. BARNES. DRILLING MACHINE.

No. 461,253. Patented Oct. 13, 1891;

15 25 1/ Jzk a? .20 J J5 35/ J) w" 4 UNITED STATES PATENT OFFICE.

IVILLIAM F. BARNES, OF ROCKFORD, ILLINOIS, ASSIGNOR TO THE V; F. & JOHN BARNES COMPANY, OF SAME PLACE.

DRILLING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 461,253, dated October 13, 1891. Application filed January 31, 1889. Serial No. 298,214. (No model.)

To all whont it may concern..-

Be it known that 1, WILLIAM F. BARNES, a citizen of the United States, residing at Rockford, in the county of WVinnebago and State of Illinois, have invented a certain new and useful Improvement in Drilling-lvlachines, of which the following is a specification.

The object of this invention isto construct a drilling-machine in which various speeds may be obtained without stopping the running of the drill'or shifting the belt, thereby dispensing with the usual cone-pulleys and, if desired, connecting the drill direct with the line-shafting.

The further object of this invention is to so construct a friction driving mechanism, and means for adjusting the tension of the friction applied to adapt it for use for light work.

In the accompanying drawings, Figure 1 is an elevation of a complete drill embodying my invention. Fig. 2 is a partial plan View showing the friction mechanism. Fig. 3 is a vertical central section through the drill-spindle and its friction driving mechanism.

The main portion of the drill represented in the accompanying drawings is of the construction shown in Patent No. 285,726, dated September 26, 1883, which consists of the hollow main supporting-column 1 with its upper curved end 2. A platen 3 is supported by the main column 1, and by means of the screw 4, engaging a collar 5, the platen is made adjustable up or down to suit the different kinds of work. The drill-spindle 6 is supported to move in bearings 7 and S of the supportingframe. A handle 9 operates the drill-spindle in its vertical movements. The rope or chain 10 connects a counterbalance-weight with the drill-spindle.

The features of my invention relate to the mechanism for driving the drill-spindle and the tool carried thereby, which I will now proceed to explain.

In place of the usual bevel gear-wheel employed to impart motion to the drill-spindle I have employed a horizontal plate 11, having a tubular projection 12 depending from its lower face. This plate is held in its working position in the bearings 7 and 13 of the main supporting-frame. A feather 14 is placed in the opening of the tubular projection 12 for a purpose to appear hereinafter.

drawings. "projecting end of the collar 15.

The bearin g 13 is screw-threaded, and a screw-(h readed collar 15 is turned therein, as shown in the A jam-nut 16 is turned on the Holes 17 and 18 are provided for the purpose of turning the collar or jam-nut, respectively, as maybe required. In the drawings I have shown a babbitt washer 19 placed between the horizon- 6o tal plate 11, and collar 15, which makes a smooth bearing-surface. The drill-spindle is lengthwise slotted and engages the feather 14, by means of which the spindle is rotated.

A'horizontal shaft 20 is supported to re- 6 volvo in bearings 21 and 22 of the main frame. Upon this shaft is supported a drive-pulley 23, which in this instance is connected by a belt 24 directly with the line-shafting, thereby dispensing with the cone-pulley usually supplied with such machines. Upon this shaft 20 is supported a pulley 25, composed of metal and leather. The metal portion consists of a flange 26, having hubs 27 and 28 projecting on either side thereof. These hubs are centrally bored of a diameter to admit the shaft 20 in a proper manner to slide thereon. A feather 29 engages the lengthwise groove 30 of the shaft 20. A leather disk 3L is placed on the hub 27 and is securedin place thereon by means of a disk 32 and screws 33,

'passing through the parts and screwed into the flange 26. Upon the hub 28 is placed a collar 34, having a lug 35, which is held in place by the collar 36. Into the lug 35 is secured a rod 37, which passes through a bearing 38 on the main frame. Aset-screw 39 or othersimilar device is screw-threaded into the bearing 38 and comes in contact with the guide-rod 37, and by means of which the rod maybe adjusted. Handles 40 project from opposite sides of the collar 34, by means of which the operator may move the pulley 25 along the horizontal shaft 20.

\Vith the parts placed in the position shown 5 in the drawings, motion being imparted to the pulley 23 by means of the belt 24 will impart a like rotary movement to the pulley 25 in the direction indicated by the arrows,

which by its friction contact with the disk 11 rco will rotate said disk, as shown in Fig. 2, consequently leaving the drill -spindle in the proper direction for drilling. The relative position of the pulley 25 with the disk 11 is such as to impart the slowest rotary movement to the disk, thereby admitting of the use of the largest-sized drill.

When the pulley 25 is directly over the center of the disk 11, the countersink 41 in the disk will allow the pulley 25 to revolve Without engaging the disk or imparting motion thereto. By means of the handles 40 the pulley 25 is moved across the face of the disk 11, and as it is moved toward the center of the disk the speed of the disk willincrease untilit has reached its greatest speed, which will be just before it enters the countersink 40. As the sneed increases so may smaller drills be used. l/Vhen the proper speed is obtained fora certain piece of work, it may be retained by means of the set-screw 39, engaging the guiderod 37. A reverse movement of the drill may be accomplished by moving the pulley25 past the center of the disk 11. The speed at first will be very rapid and gradually diminishing in velocity.

In using Very small drills there is great danger of breaking them; but by means of the screw-threaded. collar 15 and its connection With the bearing 13 the disk 11 may be raised or lowered, thereby adjustingthe friction of the pulley 25 with relation to the disk 11, and the jam-nut 16 will hold it when adjusted. The adjustment can be so delicate as to stop the rotation of the drill-spindle, thereby preventing the breaking of the drill should it from any cause become fastened.

I claim as my invention v A drilling-machine consisting of a vertical supporting-frame, a horizontal driving-shaft mounted in its upper portion, a vertical drillspindle supportedby the frame and capable of a vertical and a rotary movement, and friction mechanism forming a connection between the driving-shaft and drill-spindle, that part of the friction mechanism mounted on the driving-shaft made movable in the lengthwise direction of the shaft into and out of frictional contact with the other part, and one of the parts of the friction mechanism having its face of elastic material.

WILLIAM F. BARNES.

\Vitnesses:

JOHN BARNES, A. O. BEHEL. 

